You certainly can! Note that AutoHotkey Foundation is a non-profit, so any donations go exclusively to business costs. See the contributions section of the foundation page. Thanks for the interest
(Came late, still posting )

The donation link was not made obvious because of chris' wishes. We do not want to make look like AutoHotkey is monetized, not even for a little bit.
but, yes, perhaps it could be made a little more obvious if one wants to search for it....